<template lang="">
  <div class="navigator">
    <div class="nav-bar" v-show='!view'>
      <div class="nav-btn zoom-in" @click="zoomIn" title="放大" :class="{ 'active' : zoomRadioIn }">
        <div class="icon"></div>
      </div>
      <div class="zoom-pan">
        <div class="origin" :style="{'transform': 'translate(0, ' + getHeight(100) + 'px)'}" @click="RestoreSize"></div>
        <div class="indicator" :style="{
                 'transform': 'translate(0, ' + getHeight(this.zoom) + 'px)',
                 'transition': 'transform 200ms'
                 }"></div>
      </div>
      <div class="nav-btn zoom-out" @click="zoomOut" title="缩小" :class="{ 'active' : zoomRadioOut }">
        <div class="icon"></div>
      </div>
      <div class="nav-btn hand" @click="hand" title="拖拽" :class="{ 'active' : enableHand }">
        <div class="icon"></div>
      </div>
      <div class="nav-btn camera" @click="locateToOrigin" title="定位根节点">
        <div class="icon"></div>
      </div>
      <div class="nav-btn nav-trigger" :class="{'active' : isNavOpen}" @click="toggleNavOpen" title="导航器">
        <div class="icon"></div>
      </div>
    </div>
    <div class="nav-previewer" v-show="isNavOpen"></div>
  </div>

</template>

<script>
import { mapGetters, mapActions } from "vuex";
export default {
  name: "navigator",

  data() {
    return {
      zoom: 100,
      isNavOpen: false,
      $previewNavigator: "",
      paper: "",
      nodeThumb: "",
      connectionThumb: "",
      visibleRect: "",
      contentView: "",
      visibleView: "",
      pathHandler: ""
    };
  },

  computed: {
    ...mapGetters({
      minder: "getMinder",
      config: "config",
      view:'getView'
    }),

    enableHand() {
      return (
        this.minder.queryCommandState &&
        this.minder.queryCommandState("hand") == 1
      );
    },

    zoomRadioIn() {
      return this.getZoomRadio(this.zoom) == 0;
    },

    zoomRadioOut() {
      return this.getZoomRadio(this.zoom) == 1;
    }
  },

  methods: {
    ...mapActions(["setMemory", "getMemory"]),

    //避免缓存
    getNavOpenState() {
      var res = window.localStorage.getItem("navigator-hidden");
      return res;
    },

    zoomIn() {
      this.minder.execCommand("zoomIn");
    },

    RestoreSize() {
      this.minder.execCommand("zoom", 100);
    },

    zoomOut() {
      this.minder.execCommand("zoomOut");
    },

    hand() {
      this.minder.execCommand("hand");
    },

    getZoomRadio(value) {
      var zoomStack = this.minder.getOption && this.minder.getOption("zoom");
      if (!zoomStack) {
        return;
      }
      var minValue = zoomStack[0];
      var maxValue = zoomStack[zoomStack.length - 1];
      var valueRange = maxValue - minValue;
      return 1 - (value - minValue) / valueRange;
    },

    getHeight(value) {
      var totalHeight = $(".zoom-pan").height();
      return this.getZoomRadio(value) * totalHeight;
    },

    locateToOrigin() {
      this.minder.execCommand("camera", minder.getRoot(), 600);
    },

    toggleNavOpen() {
      var self = this;

      var isNavOpen = "";
      isNavOpen = !JSON.parse(self.getNavOpenState());
      self.setMemory({
        key: "navigator-hidden",
        value: isNavOpen
      });
      self.isNavOpen = isNavOpen;

      setTimeout(function() {
        if (self.isNavOpen) {
          self.bind();
          self.updateContentView();
          self.updateVisibleView();
        } else {
          self.unbind();
        }
      }, 100);
    },

    bind() {
      this.minder.on("layout layoutallfinish", this.updateContentView);
      this.minder.on("viewchange", this.updateVisibleView);
    },

    unbind() {
      this.minder.off("layout layoutallfinish", this.updateContentView);
      this.minder.off("viewchange", this.updateVisibleView);
    },

    updateContentView() {
      var self = this;
      var view = self.minder.getRenderContainer().getBoundaryBox();
      self.contentView = view;
      var padding = 30;

      self.paper.setViewBox(
        view.x - padding - 0.5,
        view.y - padding - 0.5,
        view.width + padding * 2 + 1,
        view.height + padding * 2 + 1
      );

      var nodePathData = [];
      var connectionThumbData = [];

      self.minder.getRoot().traverse(function(node) {
        var box = node.getLayoutBox();
        // self.pathHandler(nodePathData, box.x, box.y, box.width, box.height);
        if (node.getConnection() && node.parent && node.parent.isExpanded()) {
          connectionThumbData.push(node.getConnection().getPathData());
        }
      });

      self.paper.setStyle("background", minder.getStyle("background"));

      if (nodePathData.length) {
        self.nodeThumb
          .fill(minder.getStyle("root-background"))
          .setPathData(nodePathData);
      } else {
        self.nodeThumb.setPathData(null);
      }

      if (connectionThumbData.length) {
        self.connectionThumb
          .stroke(minder.getStyle("connect-color"), "0.5%")
          .setPathData(connectionThumbData);
      } else {
        self.connectionThumb.setPathData(null);
      }

      self.updateVisibleView();
    },

    updateVisibleView() {
      this.visibleView = this.minder.getViewDragger().getView();
      this.visibleRect.setBox(this.visibleView.intersect(this.contentView));
    }
  },

  mounted() {
    var self = this;
    var minder = self.minder;

    /**  以下部分是缩略图导航器 *
     * */

    self.$previewNavigator = $(".nav-previewer");

    // 画布，渲染缩略图
    self.paper = new kity.Paper(self.$previewNavigator[0]);

    // 用两个路径来挥之节点和连线的缩略图
    self.nodeThumb = self.paper.put(new kity.Path());
    self.connectionThumb = self.paper.put(new kity.Path());

    // 表示可视区域的矩形
    self.visibleRect = self.paper.put(
      new kity.Rect(100, 100).stroke("red", "1%")
    );

    self.contentView = new kity.Box();
    self.visibleView = new kity.Box();

    minder.setDefaultOptions({
      zoom: self.config.zoom
    });
    minder &&
      minder.on("zoom", function(e) {
        self.zoom = e.zoom;
      });

    if (self.isNavOpen) {
      self.bind();
      self.updateContentView();
      self.updateVisibleView();
    } else {
      self.unbind();
    }

    navigate();

    function navigate() {
      function moveView(center, duration) {
        var box = self.visibleView;
        center.x = -center.x;
        center.y = -center.y;

        var viewMatrix = minder.getPaper().getViewPortMatrix();
        box = viewMatrix.transformBox(box);

        var targetPosition = center.offset(box.width / 2, box.height / 2);

        minder.getViewDragger().moveTo(targetPosition, duration);
      }

      var dragging = false;

      self.paper.on("mousedown", function(e) {
        dragging = true;
        moveView(e.getPosition("top"), 200);
        self.$previewNavigator.addClass("grab");
      });

      self.paper.on("mousemove", function(e) {
        if (dragging) {
          moveView(e.getPosition("top"));
        }
      });

      $(window).on("mouseup", function() {
        dragging = false;
        self.$previewNavigator && self.$previewNavigator.removeClass("grab");
      });
    }
  }
};
</script>
